spandsp  0.0.6
lpc10_encdecs.h
1 /*
2  * SpanDSP - a series of DSP components for telephony
3  *
4  * lpc10_encdecs.h - LPC10 low bit rate speech codec.
5  *
6  * Written by Steve Underwood <steveu@coppice.org>
7  *
8  * Copyright (C) 2006 Steve Underwood
9  *
10  * All rights reserved.
11  *
12  * This program is free software; you can redistribute it and/or modify
13  * it under the terms of the GNU Lesser General Public License version 2.1,
14  * as published by the Free Software Foundation.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19  * GNU Lesser General Public License for more details.
20  *
21  * You should have received a copy of the GNU Lesser General Public
22  * License along with this program; if not, write to the Free Software
23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24  */
25 
26 #define LPC10_ORDER 10
27 
28 #if !defined(min)
29 #define min(a,b) ((a) <= (b) ? (a) : (b))
30 #endif
31 #if !defined(max)
32 #define max(a,b) ((a) >= (b) ? (a) : (b))
33 #endif
34 
35 void lpc10_placea(int32_t *ipitch,
36  int32_t voibuf[4][2],
37  int32_t *obound,
38  int32_t af,
39  int32_t vwin[3][2],
40  int32_t awin[3][2],
41  int32_t ewin[3][2],
42  int32_t lframe,
43  int32_t maxwin);
44 
45 void lpc10_placev(int32_t *osbuf,
46  int32_t *osptr,
47  int32_t oslen,
48  int32_t *obound,
49  int32_t vwin[3][2],
50  int32_t af,
51  int32_t lframe,
52  int32_t minwin,
53  int32_t maxwin,
54  int32_t dvwinl,
55  int32_t dvwinh);
56 
57 void lpc10_voicing(lpc10_encode_state_t *st,
58  int32_t *vwin,
59  float *inbuf,
60  float *lpbuf,
61  const int32_t buflim[],
62  int32_t half,
63  float *minamd,
64  float *maxamd,
65  int32_t *mintau,
66  float *ivrc,
67  int32_t *obound);
68 
69 void lpc10_analyse(lpc10_encode_state_t *st, float *speech, int32_t *voice, int32_t *pitch, float *rms, float rc[]);
70 
71 static __inline__ int32_t pow_ii(int32_t x, int32_t n)
72 {
73  int32_t pow;
74  uint32_t u;
75 
76  if (n <= 0)
77  {
78  if (n == 0 || x == 1)
79  return 1;
80  if (x != -1)
81  return (x == 0) ? 1/x : 0;
82  n = -n;
83  }
84  u = n;
85  for (pow = 1; ; )
86  {
87  if ((u & 1))
88  pow *= x;
89  if ((u >>= 1) == 0)
90  break;
91  x *= x;
92  }
93  return pow;
94 }
95 /*- End of function --------------------------------------------------------*/
96 
97 static __inline__ float r_sign(float a, float b)
98 {
99  float x;
100 
101  x = fabsf(a);
102  return (b >= 0.0f) ? x : -x;
103 }
104 /*- End of function --------------------------------------------------------*/
105 /*- End of file ------------------------------------------------------------*/
Definition: private/lpc10.h:33